7 Service and Maintenance
65
Series 340 Vacuum Gauge Controller
Instruction Manual - 340005 - Rev. D
7.3.6.2 Gauge Tube Contamination
The calibration of the gauge will be seriously affected by any gas which will attack the gold plated
sensor, and could result in over pressurizing the system. Two primary gases in this category are
mercury vapor and fluorine.
7.3.6.3 Cleaning a Convectron Gauge Tube
The Convectron gauge can be baked to 150 ºC.
When the fine sensor wire is so contaminated with oil or other films that its emissivity or its
diameter is appreciably altered, a change of calibration will result. Cleaning with trichloroethylene,
perchloroethylene, toluene, or acetone is possible but it must be done very carefully to prevent
damaging the sensor.
1.
Hold the gauge tube with the main body horizontal and the port projecting upward at an angle
of 45º. Slowly fill it with solvent using a standard wash bottle with the spout inserted in the
port to where it touches the screen.
2.
Let the solvent stand in the gauge tube for at least ten minutes.
Do not shake the gauge tube
if
the gauge tube is only partially filled—liquid forces on the sensor can become large enough to
affect the transducer calibration. If the gauge tube is completely filled, shaking is not helpful.
3.
To drain the gauge tube, position it horizontally with the port facing downward. Rotate the
gauge tube slowly and tip it end-to-end so all of the solvent drains out. By slightly warming the
gauge tube, a positive pressure will build up internally forcing the solvent out past the screen.
4.
Allow gauge tube to dry overnight with the port vertically downward and uncapped. Be
certain no solvent odor remains before reinstalling gauge tube on the system.
The fumes from any of these solvents can be dangerous to your health if inhaled and
they should be used in well ventilated areas exhausted to the outdoors. Acetone and
toluene are highly flammable and should be used away from open flame or electrical
equipment.
Содержание 20340-341-T1
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